 /*******************************************************************************
  * Copyright (c) 2004, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal;

 import org.eclipse.jface.action.IMenuManager;
 import org.eclipse.swt.graphics.Point;
 import org.eclipse.ui.presentations.IPresentablePart;
 import org.eclipse.ui.presentations.IStackPresentationSite;
 import org.eclipse.ui.presentations.StackPresentation;

 /**
  * @since 3.0
  */
 public abstract class DefaultStackPresentationSite implements
         IStackPresentationSite {

     private StackPresentation presentation;

     private int state = IStackPresentationSite.STATE_RESTORED;

     private int activeState = StackPresentation.AS_INACTIVE;

     public DefaultStackPresentationSite() {

     }

     public void setPresentation(StackPresentation newPresentation) {
         presentation = newPresentation;
         if (presentation != null) {
             presentation.setState(state);
             presentation.setActive(activeState);
         }
     }

     public StackPresentation getPresentation() {
         return presentation;
     }

     public int getState() {
         return state;
     }

     public void setActive(int activeState) {
         if (activeState != this.activeState) {
             this.activeState = activeState;
             if (presentation != null) {
                 presentation.setActive(activeState);
             }
         }
     }

     public int getActive() {
         return activeState;
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.internal.skins.IStackPresentationSite#selectPart(org.eclipse.ui.internal.skins.IPresentablePart)
      */
     public void selectPart(IPresentablePart toSelect) {

         if (presentation != null) {
             presentation.selectPart(toSelect);
         }
     }

     public void dispose() {
         if (presentation != null) {
             presentation.dispose();
         }
         setPresentation(null);
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.internal.skins.IPresentationSite#setState(int)
      */
     public void setState(int newState) {
         setPresentationState(newState);
     }

     public void setPresentationState(int newState) {
         state = newState;
         if (presentation != null) {
             presentation.setState(newState);
         }
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.internal.skins.IPresentablePart#isClosable()
      */
     public boolean isCloseable(IPresentablePart part) {
         return part.isCloseable();
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.internal.skins.IPresentationSite#dragStart(org.eclipse.ui.internal.skins.IPresentablePart, boolean)
      */
     public void dragStart(IPresentablePart beingDragged, Point initialPosition,
             boolean keyboard) {
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.internal.skins.IPresentationSite#close(org.eclipse.ui.internal.skins.IPresentablePart)
      */
     public void close(IPresentablePart toClose) {
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.internal.skins.IPresentationSite#dragStart(boolean)
      */
     public void dragStart(Point initialPosition, boolean keyboard) {
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.presentations.IStackPresentationSite#supportsState(int)
      */
     public boolean supportsState(int state) {
         return true;
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.presentations.IStackPresentationSite#getSelectedPart()
      */
     public abstract IPresentablePart getSelectedPart();

     public void addSystemActions(IMenuManager menuManager) {

     }

     public abstract boolean isPartMoveable(IPresentablePart toMove);

     public abstract boolean isStackMoveable();

 }

